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https://github.com/textstat/textstat

:memo: python package to calculate readability statistics of a text object - paragraphs, sentences, articles.
https://github.com/textstat/textstat

flesch-kincaid-grade flesch-reading-ease python readability smog textstat

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:memo: python package to calculate readability statistics of a text object - paragraphs, sentences, articles.

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README 

        
# Textstat



[![PyPI](https://img.shields.io/pypi/v/textstat.svg)](https://pypi.org/project/textstat/)

[![Build Status](https://github.com/shivam5992/textstat/actions/workflows/test.yml/badge.svg?branch=master)](https://github.com/shivam5992/textstat/actions/workflows/test.yml)

[![Downloads](https://img.shields.io/badge/dynamic/json.svg?url=https://pypistats.org/api/packages/textstat/recent?mirrors=false&label=downloads&query=$.data.last_month&suffix=/month)](https://pypistats.org/packages/textstat)



**Textstat is an easy to use library to calculate statistics from text. It helps determine readability, complexity, and grade level.**





  





  Photo by Patrick Tomasso

  on Unsplash




## Usage



```python

>>> import textstat



>>> test_data = (

    "Playing games has always been thought to be important to "

    "the development of well-balanced and creative children; "

    "however, what part, if any, they should play in the lives "

    "of adults has never been researched that deeply. I believe "

    "that playing games is every bit as important for adults "

    "as for children. Not only is taking time out to play games "

    "with our children and other adults valuable to building "

    "interpersonal relationships but is also a wonderful way "

    "to release built up tension."

)



>>> textstat.flesch_reading_ease(test_data)

>>> textstat.flesch_kincaid_grade(test_data)

>>> textstat.smog_index(test_data)

>>> textstat.coleman_liau_index(test_data)

>>> textstat.automated_readability_index(test_data)

>>> textstat.dale_chall_readability_score(test_data)

>>> textstat.difficult_words(test_data)

>>> textstat.linsear_write_formula(test_data)

>>> textstat.gunning_fog(test_data)

>>> textstat.text_standard(test_data)

>>> textstat.fernandez_huerta(test_data)

>>> textstat.szigriszt_pazos(test_data)

>>> textstat.gutierrez_polini(test_data)

>>> textstat.crawford(test_data)

>>> textstat.gulpease_index(test_data)

>>> textstat.osman(test_data)

```



The argument (text) for all the defined functions remains the same -

i.e the text for which statistics need to be calculated.



## Install



You can install textstat either via the Python Package Index (PyPI) or from source.



### Install using pip



```shell

pip install textstat

```



### Install using easy_install



```shell

easy_install textstat

```



### Install latest version from GitHub



```shell

git clone https://github.com/textstat/textstat.git

cd textstat

pip install .

```



### Install from PyPI



Download the latest version of textstat from http://pypi.python.org/pypi/textstat/



You can install it by doing the following:



```shell

tar xfz textstat-*.tar.gz

cd textstat-*/

python setup.py build

python setup.py install # as root

```



## Language support

By default functions implement algorithms for english language. 

To change language, use:



```python

textstat.set_lang(lang)

``` 



The language will be used for syllable calculation and to choose 

variant of the formula.



### Language variants

All functions implement `en_US` language. Some of them has also variants 

for other languages listed below. 



|  Function                   | en | de | es | fr | it | nl | pl | ru |

|-----------------------------|----|----|----|----|----|----|----|----|

| flesch_reading_ease         | ✔  | ✔  | ✔  | ✔  | ✔  | ✔  |    | ✔  |

| gunning_fog                 | ✔  |    |    |    |    |    | ✔  |    |



#### Spanish-specific tests

The following functions are specifically designed for spanish language.

They can be used on non-spanish texts, even though that use case is not recommended.



```python

>>> textstat.fernandez_huerta(test_data)

>>> textstat.szigriszt_pazos(test_data)

>>> textstat.gutierrez_polini(test_data)

>>> textstat.crawford(test_data)

```



Additional information on the formula they implement can be found in their respective docstrings.



## List of Functions



### Formulas



#### The Flesch Reading Ease formula



```python

textstat.flesch_reading_ease(text)

```



Returns the Flesch Reading Ease Score.



The following table can be helpful to assess the ease of

readability in a document.



The table is an _example_ of values. While the

maximum score is 121.22, there is no limit on how low

the score can be. A negative score is valid.



| Score |    Difficulty     |

|-------|-------------------|

|90-100 | Very Easy         |

| 80-89 | Easy              |

| 70-79 | Fairly Easy       |

| 60-69 | Standard          |

| 50-59 | Fairly Difficult  |

| 30-49 | Difficult         |

| 0-29  | Very Confusing    |



> Further reading on

[Wikipedia](https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests#Flesch_reading_ease)



#### The Flesch-Kincaid Grade Level



```python

textstat.flesch_kincaid_grade(text)

```



Returns the Flesch-Kincaid Grade of the given text. This is a grade

formula in that a score of 9.3 means that a ninth grader would be able to

read the document.



> Further reading on

[Wikipedia](https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests#Flesch%E2%80%93Kincaid_grade_level)



#### The Fog Scale (Gunning FOG Formula)



```python

textstat.gunning_fog(text)

```



Returns the FOG index of the given text. This is a grade formula in that

a score of 9.3 means that a ninth grader would be able to read the document.



> Further reading on

[Wikipedia](https://en.wikipedia.org/wiki/Gunning_fog_index)



#### The SMOG Index



```python

textstat.smog_index(text)

```



Returns the SMOG index of the given text. This is a grade formula in that

a score of 9.3 means that a ninth grader would be able to read the document.



Texts of fewer than 30 sentences are statistically invalid, because

the SMOG formula was normed on 30-sentence samples. textstat requires at

least 3 sentences for a result.



> Further reading on

[Wikipedia](https://en.wikipedia.org/wiki/SMOG)



#### Automated Readability Index



```python

textstat.automated_readability_index(text)

```



Returns the ARI (Automated Readability Index) which outputs

a number that approximates the grade level needed to

comprehend the text.



For example if the ARI is 6.5, then the grade level to comprehend

the text is 6th to 7th grade.



> Further reading on

[Wikipedia](https://en.wikipedia.org/wiki/Automated_readability_index)



#### The Coleman-Liau Index



```python

textstat.coleman_liau_index(text)

```



Returns the grade level of the text using the Coleman-Liau Formula. This is

a grade formula in that a score of 9.3 means that a ninth grader would be

able to read the document.



> Further reading on

[Wikipedia](https://en.wikipedia.org/wiki/Coleman%E2%80%93Liau_index)



#### Linsear Write Formula



```python

textstat.linsear_write_formula(text)

```



Returns the grade level using the Linsear Write Formula. This is

a grade formula in that a score of 9.3 means that a ninth grader would be

able to read the document.



> Further reading on

[Wikipedia](https://en.wikipedia.org/wiki/Linsear_Write)



#### Dale-Chall Readability Score



```python

textstat.dale_chall_readability_score(text)

```



Different from other tests, since it uses a lookup table

of the most commonly used 3000 English words. Thus it returns

the grade level using the New Dale-Chall Formula.



| Score       |  Understood by                                |

|-------------|-----------------------------------------------|

|4.9 or lower | average 4th-grade student or lower            |

|  5.0–5.9    | average 5th or 6th-grade student              |

|  6.0–6.9    | average 7th or 8th-grade student              |

|  7.0–7.9    | average 9th or 10th-grade student             |

|  8.0–8.9    | average 11th or 12th-grade student            |

|  9.0–9.9    | average 13th to 15th-grade (college) student  |



> Further reading on

[Wikipedia](https://en.wikipedia.org/wiki/Dale%E2%80%93Chall_readability_formula)



#### Readability Consensus based upon all the above tests



```python

textstat.text_standard(text, float_output=False)

```



Based upon all the above tests, returns the estimated school

grade level required to understand the text.



Optional `float_output` allows the score to be returned as a

`float`. Defaults to `False`.



#### Spache Readability Formula



```python

textstat.spache_readability(text)

```



Returns grade level of english text.



Intended for text written for children up to grade four.



> Further reading on

[Wikipedia](https://en.wikipedia.org/wiki/Spache_readability_formula)



#### McAlpine EFLAW Readability Score



```python

textstat.mcalpine_eflaw(text)

```



Returns a score for the readability of an english text for a foreign learner or

English, focusing on the number of miniwords and length of sentences.



It is recommended to aim for a score equal to or lower than 25. 



> Further reading on

[This blog post](https://strainindex.wordpress.com/2009/04/30/mcalpine-eflaw-readability-score/)



#### Reading Time



```python

textstat.reading_time(text, ms_per_char=14.69)

```



Returns the reading time of the given text.



Assumes 14.69ms per character.



> Further reading in

[This academic paper](https://homepages.inf.ed.ac.uk/keller/papers/cognition08a.pdf)



### Language Specific Formulas 

#### Índice de lecturabilidad Fernandez-Huerta (Spanish)  



```python

textstat.fernandez_huerta(text)

```



Reformulation of the Flesch Reading Ease Formula specifically for spanish.

The results can be interpreted similarly



> Further reading on

[This blog post](https://legible.es/blog/lecturabilidad-fernandez-huerta/)



#### Índice de perspicuidad de Szigriszt-Pazos (Spanish)  



```python

textstat.szigriszt_pazos(text)

```

Adaptation of Flesch Reading Ease formula for spanish-based texts.



Attempts to quantify how understandable a text is.



> Further reading on

[This blog post](https://legible.es/blog/perspicuidad-szigriszt-pazos/)



#### Fórmula de comprensibilidad de Gutiérrez de Polini (Spanish)  



```python

textstat.gutierrez_polini(text)

```



Returns the Guttiérrez de Polini understandability index.



Specifically designed for the texts in spanish, not an adaptation.

Conceived for grade-school level texts.



Scores for more complex text are not reliable.



> Further reading on

[This blog post](https://legible.es/blog/comprensibilidad-gutierrez-de-polini/)



#### Fórmula de Crawford (Spanish)  



```python

textstat.crawford(text)

```



Returns the Crawford score for the text.



Returns an estimate of the years of schooling required to understand the text.



The text is only valid for elementary school level texts.



> Further reading on

[This blog post](https://legible.es/blog/formula-de-crawford/)



#### Osman (Arabic)



```python

textstat.osman(text)

```



Returns OSMAN score for text.



Designed for Arabic, an adaption of Flesch and Fog Formula.

Introduces a new factor called "Faseeh".



> Further reading in

[This academic paper](https://www.aclweb.org/anthology/L16-1038.pdf)



#### Gulpease Index (Italian)



```python

textstat.gulpease_index(text)

```



Returns the Gulpease index of Italian text, which translates to 

level of education completed.



Lower scores require higher level of education to read with ease.



> Further reading on

[Wikipedia](https://it.wikipedia.org/wiki/Indice_Gulpease)



#### Wiener Sachtextformel (German)



```python

textstat.wiener_sachtextformel(text, variant)

```



Returns a grade level score for the given text.



A value of 4 means very easy text, whereas 15 means very difficult text.



> Further reading on

[Wikipedia](https://de.wikipedia.org/wiki/Lesbarkeitsindex#Wiener_Sachtextformel)



### Aggregates and Averages



#### Syllable Count



```python

textstat.syllable_count(text)

```



Returns the number of syllables present in the given text.



Uses the Python module [Pyphen](https://github.com/Kozea/Pyphen)

for syllable calculation.



#### Lexicon Count



```python

textstat.lexicon_count(text, removepunct=True)

```



Calculates the number of words present in the text.

Optional `removepunct` specifies whether we need to take

punctuation symbols into account while counting lexicons.

Default value is `True`, which removes the punctuation

before counting lexicon items.



#### Sentence Count



```python

textstat.sentence_count(text)

```



Returns the number of sentences present in the given text.



#### Character Count



```python

textstat.char_count(text, ignore_spaces=True)

```



Returns the number of characters present in the given text.



#### Letter Count



```python

textstat.letter_count(text, ignore_spaces=True)

```



Returns the number of characters present in the given text without punctuation.



#### Polysyllable Count



```python

textstat.polysyllabcount(text)

```



Returns the number of words with a syllable count greater than or equal to 3.



#### Monosyllable Count



```python

textstat.monosyllabcount(text)

```



Returns the number of words with a syllable count equal to one.



## Contributing



If you find any problems, you should open an

[issue](https://github.com/shivam5992/textstat/issues).



If you can fix an issue you've found, or another issue, you should open

a [pull request](https://github.com/shivam5992/textstat/pulls).



1. Fork this repository on GitHub to start making your changes to the master

branch (or branch off of it).

2. Write a test which shows that the bug was fixed or that the feature works as expected.

3. Send a pull request!



### Development setup



> It is recommended you use a [virtual environment](

https://docs.python.org/3/tutorial/venv.html), or [Pipenv](

https://docs.pipenv.org/) to keep your development work isolated from your

systems Python installation.



```bash

$ git clone https://github.com//textstat.git  # Clone the repo from your fork

$ cd textstat

$ pip install -r requirements.txt  # Install all dependencies



$ # Make changes



$ python -m pytest test.py  # Run tests

```